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Daily bulletin on solar and geomagnetic activity from the SIDC
Emesso: 2013 Jul 31 1156 UTC
SIDC Forecast
Brillamenti solari
Eruptive (C-class flares expected, probability >=50%)
Geomagnetism
Quiet (A<20 and K<4)
Protoni solari
Quiet
| 10cm flux | Ap | |
|---|---|---|
| 31 Jul 2013 | 116 | 006 |
| 01 Aug 2013 | 116 | 007 |
| 02 Aug 2013 | 116 | 013 |
Bulletin
NOAA AR 1801 (Catania 38) produced a C-flare yesterday, July 30. A new region turned over the east limb: NOAA AR 1809 (Catania 55). It was the source of a B and C-flares yesterday and today. We expect more C-flares from this region. The geomagnetic conditions are quiet. From August 2, Earth might come under the influence of a fast solar wind emanating from the coronal hole in the northern hemisphere. Unsettled conditions are possible.
Today's estimated international sunspot number (ISN): 067, based on 18 stations.Solar indices for 30 Jul 2013
| Wolf number Catania | 079 |
| 10cm solar flux | 113 |
| AK Chambon La Forêt | 010 |
| AK Wingst | 007 |
| Estimated Ap | 006 |
| Estimated international sunspot number | 055 - Based on 14 stations |
Noticeable events summary
| Day | Begin | Max | Fine | Loc | Strength | OP | 10cm | Catania/NOAA | Radio burst types | |
|---|---|---|---|---|---|---|---|---|---|---|
| Nessuna | ||||||||||
Provided by the Solar Influences Data analysis Center© - SIDC - Processed by SpaceWeatherLive
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X1.5 solar flare
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Notizie sul meteo spaziale
| Ultimo brillamento X | 2026/03/30 | X1.5 |
| Ultimo brillamento M | 2026/04/03 | M1.3 |
| Ultima tempesta geomagnetica | 2026/04/02 | Kp6- (G2) |
| Giorni senza macchie | |
|---|---|
| Ultimi 365 giorni | 3 giorni |
| 2026 | 3 giorni (3%) |
| Ultimo giorno senza macchie | 2026/02/24 |
| Media mensile Numero di Macchie Solari | |
|---|---|
| marzo 2026 | 85.9 +7.7 |
| aprile 2026 | 141 +55.1 |
| Ultimi 30 giorni | 95.4 +31.2 |
